const state = {
    // // { id: 商品id, count: 购买数量，selected: false  }
    car: getItem('car'),
    // // 当前要购买的商品：buy: [{ id: '', count: '' }]
    // // 当在购物车里点“去结算”时，就把购物车车中已经选中的商品放进去
    buy: getItem('buy')
  }


  function setItem(name, item) {
    localStorage.setItem(name, JSON.stringify(item))
  }
  function getItem(name) {
    return JSON.parse(localStorage.getItem(name) || '[]')
  }
  

const getters = {
    // 获取商品数量
    getGoodsCount (state) {
      var goods = {}
      state.car.forEach(item => {
        goods[item.id] = item.count
      })
      return goods
    },
    // 获取商品有没有选中的状态值（selected）
    getGoodsSelected (state) {
      var goods = {}
      state.car.forEach(item => {
        goods[item.id] = item.selected
      })
      return goods
    },
    // 获取选中的商品的件数
    getSelectedCount (state) {
      var count = 0
      state.car.forEach(item => {
        if (item.selected) {
          count += item.count
        }
      })
        return count
    },
    // 获取选中的商品
    getSelectedGoods (state) {
        var goods = {}
        state.car.forEach(item => {
            if (item.selected) {
                goods[item.id] = item
            }
        })
        return goods
    },
    // 获取要购买的商品
    getBuy (state) {
        var goods = {}
        state.buy.forEach(item => {
        goods[item.id] = item
        })
        return goods
    }

}

  const actions = {}
  const mutations = {
    addCar (state, goodsinfo) {
      var flag = false
      state.car.some(item => {
        if (item.id == goodsinfo.id) {
            item.count += parseInt(goodsinfo.count)
            flag = true
            return true
          }
        })
        if (!flag) {
          state.car.push(goodsinfo)
        }
        setItem('car', state.car)
    },
    updateGoodsInfo (state, goodsinfo) {
        state.car.some(item => {
          if (item.id == goodsinfo.id) {
            item.count = parseInt(goodsinfo.count)
            return true
          }
        })
        setItem('car', state.car)
    },
    updateGoodsSelected (state, info) {
        state.car.some(item => {
          if (item.id == info.id) {
            item.selected = info.selected
          }
        })
        setItem('car', state.car)
    },
    removeCar (state, id) {
        state.car.some((item, i) => {
          if (item.id == id) {
            state.car.splice(i, 1)
            return true
          }
        })
        setItem('car', state.car)
    },
    setBuy (state, goods) {
      state.buy = []
      if (goods) {
        state.buy.push(goods)
      } else {    
        state.car.some(item => {
          if (item.selected) {
            state.buy.push(item)
          }
        })
      }
      setItem('buy', state.buy)
    }
  
    
  }

  
  export default {
    namespaced: true,
    state,
    getters,
    actions,
    mutations
  }
  